Electric brake.



` No. 660,487. Patented oct. 23, leon; F. E. CASE.`

ELECTRIC BRAKE.

(Application led Aug. 5, 1898.)

(No Model.) 3 Sheets-Sheet I.

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No. 000,487. Patented 0st. 23, |900. F. E. CASE.

ELECTRIC BRAKE.

Application med Aug. 5, 109s.) (No Model.) 3 Sheets-Sheet 2.

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ELECTRIC BRAKE.

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shoe cooperates.

UNITED STATES PATENT OFFICE.

FRANK E. CASE, OF SCHENECTADY, NEW YORK, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

ELECTRIC BRAKE.

SPECIFICATION `forming part of Letters Patent No. 660,487, dated October 23. 1900.

Application filed August 5: 1398' To all whom, it may concern:

Be it known that I, FRANK-E. CASE, acitizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electric Brakes, (Case No. 714,) of which the following is a specification.

My invention relates to the art of electric braking and to that class of brakes in which an electromagnet is energized at desired times and by its effect upon a moving part of the machine brings the apparatus to rest. These devices find their most useful application in electrically-operated railways and tramways, in which the electromagnet is usually fixed and of disk-like form, coperating with a disk rotating with the axle.

My invention aims to provide in this class of apparatus a form of support which makes it possible to apply the brake-shoe to the outside of the wheel instead of placing it, as has heretofore been customary, between the wheel and the motor. Many modern forms of electric motor demand the entire axle length on account of the large output now required, and thus no space is left within the Wheelbase in which to put the brakes.

In carrying my invention into effect I support the brake-shoe from the truck-frame, preferably mounting it upon the axle-box, and I provide a suitable bearing surface against which the shoe may rub, either by facing 0H a portion of the wheel or by applying thereto a properly-machined disk. To avoid variation of the air-gap, and consequent irregularity in the braking action, I employ a limiting device of any suitable kind, such that the brake-shoe is compelled to follow the end play of the axle whenever the latter moves to a position which would otherwise increase the air-gap beyond the desired limit. In this way I am enabled to accomplish a result not hitherto obtainable, in that I may lemploy an integral annular brake-shoe and disk or rubbingsurface with which the brake- I-Ieretofore it has been nec- -essary to cut both shoe and disk in order to mount them or else leave a gap through which the axle may pass. tion this is not required.

In my construc- Serial No. 687,821. (No model.)

The drawings annexed show an embodiment of my invention.

Figure l is a side elevation of a car-wheel and a part of a truck to which the improvement has been applied. Fig. 2 is a partial section upon the line 2 2 of Fig.` 1. Fig. Sis a side elevation, partly in section, upon the line 3 3 of Fig. 2, of the car-wheel and shoe with the axle-box removed. Fig. 4 is a representation of a brake-shoe detached. Fig. 5 is a side elevation of the disk, so called; and Fig. 6 is a section on the line 6 6 of Fig. 4.

A general idea of the arrangement of the mechanism is obtained best from Fig. 2, to which reference will Iirst be made. In describing this figure reference is also had to Figs. 1 and 3, which show other views of the saine parts.

A is the tread of the wheel.

B is the web mounted ou the axle C. To the web is affixed by the bolts E E the disk D, which thus revolves With the wheel. Also affixed to the web by the screws L L is the collar F, against the inner face of which bears the web H2, formed upon the brake-shoe H. The latter is a single casting forming, approximately, an annulus completely closed. In this it differs from all other shoes with which I am acquainted, none of them being an integral structure. The disk D may also, if desired, form a complete annulus. Both these parts may be easily slipped over the journal. y

M is the journal-box, mounted in the case illustrated in a pedestal composed of back and front plates n n, held together by bolts N N. Secured to the journal-box in any desired manner or made in one with it is a bar G, having a horizontal portion G. Upon this part of the bar rests the brake-shoe H. At the top and bottom of the shoe are lugs H' H', in suitable bearings in which rest other lugs I I, which prevent the rotation of the shoe when it is energized and applied to 'the disk or annulus D. The coil Q, constituting the energizing-winding, is mounted in a groove in the body of the shoe and is held in place by a suitable illing. Since the shoe is an integral aunulus, I am .enabled to make use of an energizing-winding comprising a single IOO coil, substantially circular in form. In order to prevent the disk from wearing unevenly, I make the groove containing the energizingwinding eccentric to the body of the shoe. as

pointed out in the patent to W. G. Cary, No. 539,855, dated May 28, 1895.

As seen in Fig. l, the bars O of the truckfr'ame on which the body ot' the car is supported are carried on the journal-box in the usual way, and springs P are provided wherever it is necessary or desired.

Fig. 4 shows the rubbing-face of the shoe, with the coil shown in dotted lines.

Fig. 5 shows the annulus or disk D, forming the rubbing-surface against which bears the brake-shoe. Itis provided withastitfening-flange d and bolt-holes e e for attaching it to the wheel. The iiange d bears against the wheel-center and lessens the strain on these bolts. The disk is, as will be seen, an integral annulus, the utility of which has been already pointed out.

The construction shown in Fig. 6 is sufficiently apparent from the reference-letters, which indicate the same parts as in the other figures.

It will be seen that the mounting of the brake-shoe outside of the Wheel-base forms an important feature of my invention and and for allowing play of the shoe between limit-s and the support, more especially, of the shoe in practically invariable relation to the axle, which I find to be conveniently accomplished by placing it upon the axle-box.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

l. In combination in a car-truck, a frame, for supporting the body of the car, provided with bearings for the car-axles, an electric brake-shoe slidingly supportedfrom said frame outside of the wheel, and a suitable bearing-surface for said shoe on the outer face of the wheel.

2. In combination in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe, comprising an annulus provided with an energizing-winding, slidingly supported from said frame outside of the wheel, and a suitable bearing-surface for said shoe 011 the outer face of the wheel.

3. In combination in a car-truck, a frame provided with bearings for the car-axles, an

electric brake-shoe slidingly supported from said frame outside of the wheel, and an annulus or disk, provided with a suitable bearing-surface for said shoe, lixed to the axle.

4t. In combination in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe, means carried by said frame for slidingly supporting said brakeshoe between the frame and the Wheel, and a suitable bearing-surface on said wheel opposite to said shoe.

5. In combination in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe, means carried by said frame for slidingly supporting said brakeshoe between the frame and the wheel, a suitable bearing-surface on said wheel opposite to said shoe, and means carried by the axle for limiting the movement of the shoe away from its bearing-surface.

6. In combination in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe supported between the frame and the Wheel, a suitable bearing-surface on said Wheel opposite to the shoe, and one or more lugs on the frame engaging said shoe to preventrotation of the same.

7. In combination in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe, comprising an annulus provided with an energizing-winding, supported between the frame and the wheel, a suitable bearing-surface on said wheel opposite to said shoe, and one or more lugs on the frame engaging said shoe to prevent rotation of the same.

8. In combination in a car-truck, a frame, boxes for the axle-bearings mounted in said frame, an electricbrake-shoe, provided with -an energizing-winding, carried by the box between the frame and the Wheel, and a suitable bearing-surface for said shoe on the outer face of the wheel.

9. In combination, in a car-truck, a frame.

provided with bearings for the car-axles, an electric brake-shoe, comprising an annulus provided with an energizing-winding, supported between the frame and wheel, a suitable bearing-surface on said wheel opposite to said shoe, means for preventing rotation of the brake-shoe, and means carried by the axle for limiting the movement of said shoe away from its bearing-surface.

10. In combination, in a car-truck, a frame provided With bearings for the car-axles, an electric brake-shoe, comprising an annulus provided With an energizing-Winding, supported between the frame and wheel, a suitable bearing-surface on said wheel opposite to said shoe, means for preventing rotation of the brake-shoe, and a flanged ring carried by the axle, arranged to engage the brakeshoe upon excessive end play of said axle thereby limiting the air-gap between the said shoe and its bearing-surface to a determined maximum.

11. In combination, in a car-truck, a frame provided with bearings for the car-axles, an electric brake-shoe, comprising an annulus provided with an energizing-winding, supported between the frame and wheel, a suitable bearing-surface on said wheel opposite to said shoe, means for preventing rotation of the brake-shoe, and an adjustable device for limiting the movement of said brake-shoe away from its bearing-surface.

l2. In combination, in a car-truck, a frame, boxes provided with axle-bearings mounted ICO IIO

said annuius and disposed eoeentricelly there- Io to, and an energizing-coil in said groove.

In testimony whereof I have hereunto set my hemd this 3d day of August, 1898.

FRANK E. CASE.

Witnesses:

B. B. HULL, M. H. EMERSON. 

